|Boot off the Win98 boot floppy, then at the A:\> prompt, type FDISK /MBR, then press Enter.|
To install Win98 over Win95 without formatting, you will have to rename WIN.COM. If you don't, you will NOT be able to install 98. Boot into 95, find all WIN.COM files & rename them WIN.OLD, then shutdown. At this point, you will no longer be able to boot into Win95. Is your Win98 CD bootable? If it is, just boot off it & install. If it's not, you'll have to boot off the Win98 boot floppy to start the installation.